Add test with only ASCII and uniform distribution

Covers some edge cases of compression Huffman algorithm
airlift · Jan 11, 2019 · 2017642 · 2017642
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commit 2017642
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diff --git a/src/test/java/io/airlift/compress/benchmark/DataSet.java b/src/test/java/io/airlift/compress/benchmark/DataSet.java
@@ -74,6 +74,7 @@ public class DataSet
             "artificial/aaa.txt",
             "artificial/alphabet.txt",
             "artificial/random.txt",
+            "artificial/uniform_ascii.bin", // random ASCII with uniform probabilities per symbol
 
             "large/bible.txt",
             "large/E.coli",

diff --git a/testdata/artificial/uniform_ascii.bin b/testdata/artificial/uniform_ascii.bin